Towards the Next Generation
of Radiative Transfer Models:

Radiance Cascades

Chris Osborne

University of Glasgow

Contents

  • Where are we now?
  • Radiance Cascades
  • Applications

Non-LTE Radiative Transfer

  • Coupling between radiation field and atomic transitions.
  • Extremely computationally demanding, but necessary for spectral lines.
  • Needed for models, diagnostics, and inversions.
  • RT codes designed around the idea of smooth atmospheres
  • But ours look like this

Jenkins & Keppens 2021

Most Important Quantities

\[ \begin{aligned} J_\nu(\vec{p}) &= \frac{1}{4\pi}\oint_\mathbb{S^2} I_\nu(\vec{p},\hat{\omega}) \mathop{d \hat{\omega} } \\ &\vec{p} \in \mathbb{R}^3, \hat{\omega} \in \mathbb{S}^2\\ \end{aligned} \]
  • Specific intensity and its first moment.
  • 4 and 6 dimensional functions!

Prominence Albedo

Jenkins+ 2024

Ray effects & resolution
Penumbra criterion
Rc construction
Examples
Some other stuff
Column 1 Content
  • A thing
  • Another thing
Column 2 Content